Otocinclus are social creatures and thrive when kept together in a group. They exhibit schooling behavior and often stick together, particularly when resting or feeding. Being kept in a group reduces their stress levels, enhances their natural behavior, and can contribute to their longevity.
Aquarium hobbyists are advised to keep a minimum group of 3-6 Otocinclus, although they are better off in larger groups if the tank size allows. Having ample Otos also means more efficient algae cleanup. Therefore, if you’re planning on getting Otos, they’ll be much happier and healthier in groups!